movement, passage, or change from one position, state, stage, subject, concept, etc., to another; change

the transition from adolescence to adulthood.

Music .

a passing from one key to another; modulation.

a brief modulation; a modulation used in passing.

a sudden, unprepared modulation.

a passage from one scene to another by sound effects, music, etc., as in a television program, theatrical production, or the like.

to make a transition

He had difficulty transitioning from enlisted man to officer.